Manufacturing method of heat exchanger

Abstract

The invention discloses a manufacturing method of a heat exchanger, belongs to the field of manufacturing of heat exchange equipment, solves the problem of high cost of a surface coating of a heat exchange plate in the prior art, and adopts the technical scheme that the manufacturing method of the heat exchanger is mainly characterized in that the heat exchanger comprises a bracket, the heat exchange plate provided with a cold side inlet and a cold side outlet, and a plurality of side plates provided with through holes; the through holes are matched with cold side inlets and outlets of the heat exchange plates; s100, the cold side inlet and outlet of the heat exchange plate and the through hole of the side plate are welded together in a sealed mode; s200, the outer surface of the heat exchange plate is subjected to a coating process of a wear-resistant and corrosion-resistant layer; and S300, the multiple side plates in the step S200 are sequentially connected to a support in a sealed mode in the front-back direction, so that the multiple heat exchange plates are distributed in the support at intervals in the front-back direction. The method is mainly used for realizing low-cost coating on the surface of the heat exchange plate.

Description

Technical Field

[0001] This application relates to the field of manufacturing heat exchange equipment, and in particular to a manufacturing method of a heat exchanger. Background Art

[0002] In the prior art, there are scenarios of flue gas waste heat recovery. Since there are dust and corrosive gases in the flue gas, a wear-resistant and corrosion-resistant material coating is usually applied on the surface of the heat exchange plate. Usually, an enamel material coating is applied on the surface of the heat exchange plate, with strong corrosion resistance: The enamel coating has good tolerance to chemical substances such as acids, alkalis, and salts. Except for a few strong acids such as hydrofluoric acid and hot phosphoric acid, it can remain stable in most chemical media and is not easily corroded, which makes it widely used in industries with high corrosion resistance requirements such as chemical industry, food, and medicine, and can be used to protect equipment and containers from chemical erosion. Good oxidation resistance: In environments such as high temperature and humidity, the enamel coating can effectively prevent oxygen from contacting the base metal, prevent metal oxidation and rust, and extend the service life of the equipment. For example, outdoor enamel billboards, architectural decorative enamels, etc. can maintain the surface smoothness and color for a long time and are not easily faded or damaged due to oxidation.

[0003] However, in the existing plating process, it is impossible to plate a large number of heat exchange plates simultaneously. Since the enamel layer attached to the surface of the heat exchange plate belongs to an inorganic vitreous material and is relatively brittle in nature, it is prone to cracking, peeling, etc. when subjected to mechanical shock, thermal shock, or stress. And once damaged, it is difficult to restore the original performance and appearance like some metal materials through simple welding, repair, etc. Therefore, the heat exchange plate with an enamel layer cannot be directly installed in the heat exchanger by welding, etc. Firstly, welding the heat exchange plate with an enamel layer to the side plate of the heat exchange plate will inevitably damage the coating. Secondly, when welding, the heat exchange plate will undergo a certain deformation, resulting in a certain stress on the coating of the heat exchange plate, making the coating prone to cracking and peeling during the subsequent use of the heat exchange plate. The commonly used method in the prior art is to first weld the heat exchange plate to the side plate of the heat exchanger, and then apply an enamel material coating to the heat exchange plate by manual plating. And because the gap after the heat exchange plate is installed is relatively narrow, only one heat exchange plate can be plated at a time. After plating one heat exchange plate, the welding and plating of the next plate are carried out. The production cost is extremely high, and the effects of manual plating are also uneven, and the time cost is also relatively large, which makes the cost of the heat exchanger with an enamel coating on the surface of the heat exchange plate always remain high. If all heat exchange plates are to be plated simultaneously, the heat exchange plates can only be welded to the side plates of the heat exchanger first, and then the entire group of heat exchange plates and side plates are plated. However, due to the narrow gap after the heat exchange plates are installed, the plating effect is not ideal, and this type of method requires the use of large plating machines to work, with extremely high production costs. Summary of the Invention

[0004] In order to overcome the deficiency of the high cost of the surface coating of the heat exchange plate in the prior art, the present application provides a manufacturing method of a heat exchanger, which can realize low-cost coating on the surface of the heat exchange plate.

[0005] In order to achieve the above object, the present application adopts the following technical solutions: A manufacturing method of a heat exchanger, the heat exchanger includes a bracket, a heat exchange plate provided with cold-side inlets and outlets, and a plurality of side plates with through holes, and the through holes are adapted to the cold-side inlets and outlets of the heat exchange plate; S100: Hermetically weld the cold-side inlets and outlets of the heat exchange plate to the through holes of the side plates; S200: Perform a coating process of a wear-resistant and corrosion-resistant layer on the outer surface of the heat exchange plate; S300: Sequentially and hermetically connect a plurality of side plates in step S200 to the bracket along the front-back direction, so that a plurality of heat exchange plates are in a state of being spaced apart from each other in the front-back direction within the bracket.

[0006] After adopting the above technical solutions, the present application has the following advantages: In the prior art, the heat exchange plate is first welded to the side plate of the heat exchanger and then coated manually, and only one heat exchange plate can be coated at a time, with high cost. In this solution, the cold-side inlets and outlets of the heat exchange plate are first hermetically welded to the through holes of the side plates, and then the outer surface of the heat exchange plate is uniformly subjected to a wear-resistant and corrosion-resistant coating process, and then the side plates are connected to the bracket. In this way, batch coating of multiple heat exchange plates can be realized, avoiding the high-cost problem caused by only single-piece coating in the prior art, effectively reducing the production cost, and the welded connection between the side plates will not affect the coating on the heat exchange plate, nor will it increase the stress on the heat exchange plate. Moreover, in this solution, welding is performed first and then coating, which can effectively avoid damage to the coating caused by welding, and reduce the stress deformation of the heat exchange plate after coating, ensuring the integrity and stability of the coating, thereby prolonging the service life of the heat exchange plate.

[0007] Further, in step S200, the side plate includes a body and a wear-resistant and corrosion-resistant layer, and the wear-resistant and corrosion-resistant layer is provided on the surface of the body facing the heat exchange plate.

[0008] Adopting the foregoing technical solutions, there are soot and corrosive gases in the flue gas, which will not only corrode the heat exchange plate, but also erode the side plates in contact with it. Coating the surface of the side plate facing the heat exchange plate with a wear-resistant and corrosion-resistant layer can effectively protect the side plate, making it not easily corroded and damaged when in long-term contact with corrosive media such as flue gas, thereby prolonging the service life of the side plate and ensuring the stability and reliability of the entire heat exchange equipment.

[0009] Further, in step S200, the body includes a connection surface facing an adjacent side plate, and two adjacent side plates are connected through the two connection surfaces.

[0010] With the foregoing technical solution, in the subsequent step S300, several side plates need to be hermetically connected to the bracket in the front-back direction in sequence, and the connecting surface is not plated, which can ensure that the metal surface of the connecting surface has good weldability. Since the plating materials (such as wear-resistant and corrosion-resistant materials like enamel) are inherently brittle, and some plating materials may affect the welding quality. If the connecting surface has a plating, welding may cause insecure welding and problems such as plating cracking and peeling in other parts. However, the connecting surface without plating can avoid these problems, making the welding between the side plate and the bracket smoother and more reliable, and ensuring the stability of the entire heat exchange equipment structure.

[0011] Further, in step S300, the connecting surfaces are hermetically connected by welding.

[0012] With the foregoing technical solution, for a heat exchange equipment, good sealing performance is crucial to prevent leakage of internal media such as flue gas. Welding can form a continuous and tight connection between the connecting surfaces, effectively preventing the medium from leaking out from the connecting surface position. Compared with some other connection methods (such as bolt connection may require additional sealing measures and there is a risk of sealing failure), the sealing effect of welding is more reliable, thus ensuring the sealing of the heat exchange equipment and improving the safety of equipment operation.

[0013] Further, in step S300, the connecting surfaces are hermetically connected by a combination of detachable connection members and sealing strips.

[0014] With the foregoing technical solution, the detachable connection enables the side plates to be easily disassembled when the equipment needs maintenance, repair or replacement of damaged components (such as heat exchange plates). If non-detachable connection methods such as welding are used, once internal components have problems, the repair is difficult, and it may even be necessary to damage the overall structure of the equipment to carry out the repair. However, the detachable connection can quickly open the equipment, facilitating technicians to inspect and repair the interior, saving repair time and cost, and improving the maintainability of the equipment.

[0015] Further, it also includes several intermediate plates. In step S300, the side plates are hermetically welded to the bracket through the intermediate plates, and two adjacent side plates in the front and back are hermetically welded together through the intermediate plates.

[0016] With the foregoing technical solution, the addition of the intermediate plates increases the connection area and connection points between the side plates and the bracket as well as between adjacent side plates, making the connection between the entire heat exchange plate assembly and the bracket more firm. During the operation of the equipment, it can better withstand external forces such as internal medium pressure and vibration, reduce problems such as deformation and loosening caused by uneven stress at the connecting surface position, improve the strength and stability of the overall structure of the equipment, and extend the service life of the equipment.

[0017] Further, in step S300, the cold-side fluid enters and exits through the cold-side inlet and outlet, and flows in the left-right direction; the hot-side fluid flows from top to bottom in the flue gas channel between two adjacent heat exchange plates.

[0018] With the foregoing technical solution, the cold-side fluid and the hot-side fluid adopt this perpendicular cross-flow mode (the cold side flows left and right, and the hot side flows up and down), which can make the two fluids fully contact on the surface of the heat exchange plate, increasing the heat exchange area and time. Compared with parallel flow and other modes, this cross-flow can more effectively promote heat transfer, improve the heat exchange efficiency, enabling the cold-side fluid to better absorb the heat carried by the hot-side fluid (such as flue gas), thereby enhancing the performance of the entire heat exchange device.

[0019] Further, it also includes a sealing plate. The sealing plate includes a base plate, a sealing surface for connecting the bracket, and a wear-resistant and corrosion-resistant coating. The wear-resistant and corrosion-resistant layer is provided on the side of the base plate facing the heat exchange plate, and the sealing surface is located on the side facing the bracket. After step S300, there is step S400: Set the side of the base plate of the sealing plate with the wear-resistant and corrosion-resistant coating facing the heat exchange plate, and the sealing surface of the sealing plate faces the bracket and is welded and sealed with the bracket through the sealing surface.

[0020] With the foregoing technical solution, the setting of the sealing plate further strengthens the sealing performance of the entire heat exchange device. By setting the side of the sealing plate with the wear-resistant and corrosion-resistant coating facing the bracket and using the sealing surface to weld and seal with the bracket, it can effectively prevent the hot-side fluid from leaking from the edge part of the device, improving the safety and stability of the device operation. The setting of the sealing plate and the design of its surface coating and sealing surface are adapted to the processing techniques of components such as heat exchange plates and side plates in the previous steps. All components of the entire device adopt wear-resistant and corrosion-resistant protection measures, forming a complete protection system, enabling the device to better perform in a complex working environment and improving the applicability and durability of the device.

[0021] Further, both ends of the sealing plate extend and cover the outer end surface of the bracket, and the sealing plate is welded and sealed with the outer end surface of the bracket.

[0022] With the foregoing technical solution, welding the sealing plate to the front and back surfaces of the bracket further strengthens the sealing performance at the front and rear ends of the device. When fluids such as flue gas on the hot side and the cold-side fluid flow inside the device, they are more tightly restricted within the established space, effectively preventing the fluid from leaking from the front and rear ends of the device, ensuring the stable progress of the heat exchange process in a closed environment, and improving the safety and reliability of the device operation.

[0023] Further, the wear-resistant and corrosion-resistant coating includes one of an enamel coating, a metal-based coating, an electroplated hard chromium coating, a plasma-sprayed ceramic coating, a chemical vapor deposition ceramic coating, and an epoxy ceramic coating.

[0024] Adopting the foregoing technical solution, the enamel coating on the surface of the heat exchanger has excellent corrosion resistance and can resist the erosion of various chemical substances such as acids, alkalis, and salts; the surface is smooth, not easy to adhere to dirt and impurities, has good wear resistance, and can effectively reduce frictional losses; the insulation performance is good, which can avoid electrical failures during the operation of the equipment. The metal matrix coating is a coating formed on the metal surface by methods such as thermal spraying and electroplating with metal as the matrix and adding various alloying elements or ceramic particles and other reinforcing phases. Its principle is to utilize the toughness of the metal matrix and the wear resistance, corrosion resistance and other characteristics of the reinforcing phase to improve the comprehensive performance of the coating. The electroplated hard chromium coating is a hard and bright coating formed by electroplating chromium metal on the metal surface. During the electroplating process, chromium ions obtain electrons at the cathode and are reduced to chromium atoms, gradually depositing to form the coating. Chromium has high hardness and low friction coefficient, which can improve the wear resistance and corrosion resistance of the coating. The plasma-sprayed ceramic coating is formed by melting ceramic powder with the high temperature generated by the plasma arc and spraying it onto the metal surface at high speed to form a ceramic coating. Ceramic materials have characteristics such as high hardness, high melting point, and good chemical stability. Combined with the metal matrix through the plasma spraying process, they play a role in wear resistance and corrosion resistance. The chemical vapor deposition ceramic coating is formed by depositing a ceramic coating on the metal surface by the chemical reaction of gaseous substances at high temperature. By controlling parameters such as the type, concentration, and temperature of the reaction gas, the composition and structure of the coating can be precisely controlled, thereby obtaining ceramic coatings with different properties. The epoxy ceramic coating is a coating made with epoxy resin as the matrix and adding ceramic powder and other fillers. Epoxy resin has good adhesion and corrosion resistance, and the ceramic powder can improve the hardness and wear resistance of the coating. During the curing process, the epoxy resin undergoes a cross-linking reaction with the curing agent to form a three-dimensional network structure, firmly bonding the ceramic powder together to form a wear-resistant and corrosion-resistant coating. Description of the Drawings

[0025] The present application will be further described below with reference to the drawings: Figure 1 It is a schematic diagram of the heat exchanger of the present application; Figure 2 It is a left view of the heat exchanger; Figure 3 It is a schematic diagram of the heat exchanger in Embodiment 2.

[0026] Description of the Drawings: 1. Bracket; 2. Heat exchange plate; 21. Cold side inlet and outlet; 3. Side plate; 31. Through hole; 32. Connection surface; 4. Intermediate plate; 5. Sealing plate; 51. Sealing surface. Detailed Embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part rather than all of the embodiments of this application.

[0028] The terms "first", "second", etc. (if any) in the description and claims of this application are used to distinguish similar objects rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily imply the existence of "first". It should be understood that in this application, "including" and "having" and any of their variations are intended to cover non-exclusive inclusion. It should be understood that in this application, "a plurality of" means two or more. "And / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y may represent: X exists alone, X and Y exist simultaneously, and Y exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "Including X, Y, and Z" and "including X, Y, Z" mean that all of X, Y, and Z are included. "Including X, Y, or Z" means including any one of X, Y, and Z. "Including X, Y, and / or Z" means including any one or any two or all three of X, Y, and Z.

[0029] The following will specifically describe the technical solutions of this application with specific embodiments. These several specific embodiments can be combined or replaced according to the actual situation. For the same or similar concepts or processes, they may not be repeated in some embodiments.

[0030] Embodiment 1: As Figures 1 to 2 shown, this application provides a manufacturing method for a heat exchanger. The heat exchanger includes a bracket 1, a heat exchange plate 2 provided with cold-side inlets and outlets 21, and several side plates 3 with through holes 31. The through holes 31 are adapted to the cold-side inlets and outlets 21 of the heat exchange plate 2. S100: Hermetically weld the cold-side inlets and outlets 21 of the heat exchange plate 2 to the through holes 31 of the side plates 3. S200: Apply a plating process for a wear-resistant and corrosion-resistant layer to the outer surface of the heat exchange plate 2. S300: Sequentially and hermetically connect several side plates 3 in step S200 to the bracket 1 in the front-rear direction, so that several heat exchange plates 2 are in a state of being spaced apart front and rear within the bracket 1.

[0031] After adopting the above technical solution, the present application has the following advantages: In the prior art, the heat exchange plate 2 is first welded to the side plate 3 of the heat exchanger and then plated manually, and only one heat exchange plate 2 can be plated at a time, resulting in high costs. In this solution, the cold-side inlets and outlets 21 of the heat exchange plate 2 are first hermetically welded to the through holes 31 of the side plate 3, and then the outer surface of the heat exchange plate 2 is uniformly subjected to a wear-resistant and corrosion-resistant plating process. After that, the side plate 3 is connected to the bracket 1. This can achieve batch plating of multiple heat exchange plates 2, avoiding the high-cost problem caused by single-piece plating in the prior art, effectively reducing the production cost. Moreover, the welded connection between the side plates 3 does not affect the plating on the heat exchange plate 2, nor does it increase the stress on the heat exchange plate 2. And in this solution, welding is carried out first and then plating, which can effectively avoid damage to the plating caused by welding and reduce the stress deformation of the heat exchange plate 2 after plating, ensuring the integrity and stability of the plating, thereby extending the service life of the heat exchange plate 2.

[0032] Further, in step S200, the side plate 3 includes a body and a wear-resistant and corrosion-resistant layer, and the wear-resistant and corrosion-resistant layer is provided on the surface of the body facing the heat exchange plate.

[0033] Adopting the foregoing technical solution, there are dust and corrosive gases in the flue gas, which will not only corrode the heat exchange plate 2, but also erode the side plate 3 in contact with it. Plating the surface of the side plate 3 facing the heat exchange plate 2 with a wear-resistant and corrosion-resistant layer can effectively protect the side plate 3, making it not easily corroded and damaged when in long-term contact with corrosive media such as flue gas, thereby extending the service life of the side plate 3 and ensuring the stability and reliability of the entire heat exchange equipment.

[0034] Further, in step S200, the body includes a connection surface facing the adjacent side plate, and two adjacent side plates are connected through the two connection surfaces.

[0035] Adopting the foregoing technical solution, in the subsequent step S300, several side plates 3 need to be hermetically connected to the bracket 1 in sequence in the front-rear direction, and the connection surface 32 is not plated on the surface, which can ensure that the metal surface of the connection surface 32 has good weldability. Because wear-resistant plating materials (such as enamel and other wear-resistant and corrosion-resistant materials) are inherently brittle, and some plating materials may affect the welding quality. If the connection surface 32 has a plating, it will lead to insecure welding, and problems such as plating cracking and peeling may occur in the plating of the remaining parts during welding. However, the non-plated connection surface 32 can avoid these problems, making the welding between the side plate 3 and the bracket 1 smoother and more reliable, ensuring the stability of the structure of the entire heat exchange equipment.

[0036] Further, in step S300, the connection surfaces 32 are hermetically connected by welding.

[0037] Adopting the foregoing technical solution, for a heat exchange device, good sealing performance is crucial to prevent leakage of internal media such as flue gas. Welding can form a continuous and tight connection between the connection surfaces 32, effectively preventing the medium from seeping out from the connection surfaces 32. Compared with some other connection methods (such as bolt connection which may require additional sealing measures and has a risk of sealing failure), the sealing effect of welding is more reliable, thus ensuring the sealing performance of the heat exchange device and improving the safety of the device operation.

[0038] In step S300 of another embodiment, the connection surfaces 32 are hermetically connected by a combination of a detachable connection member and a sealing strip.

[0039] Adopting the foregoing technical solution, the detachable connection enables the side plate 3 to be conveniently disassembled when the device needs maintenance, repair or replacement of damaged components (such as the heat exchange plate 2). If a non-detachable connection method such as welding is used, once a problem occurs in the internal components, the repair is difficult, and it may even be necessary to damage the overall structure of the device to carry out the repair. The detachable connection can quickly open the device, facilitating technicians to inspect and repair the interior, saving repair time and cost, and improving the maintainability of the device.

[0040] Specifically, the detachable connection includes bolt connection and snap connection, etc.

[0041] Furthermore, in step S300, the cold-side fluid enters and exits through the cold-side inlet and outlet 21 and flows in the left-right direction; the hot-side fluid flows from top to bottom in the flue gas channel between two adjacent heat exchange plates 2.

[0042] Adopting the foregoing technical solution, the cold-side fluid and the hot-side fluid adopt this vertical cross-flow mode (the cold-side flows left and right, and the hot-side flows up and down), which can make the two fluids fully contact on the surface of the heat exchange plate 2, increasing the heat exchange area and time. Compared with the parallel flow mode and other methods, this cross-flow can more effectively promote heat transfer, improve the heat exchange efficiency, enabling the cold-side fluid to better absorb the heat carried by the hot-side fluid (such as flue gas), thereby enhancing the performance of the entire heat exchange device.

[0043] Specifically, the upper and lower openings of the bracket 1 are directly connected to the flue to enable the flue gas to directly pass through the heat exchange plate 2 for heat exchange.

[0044] Further, it further includes a sealing plate 5. The sealing plate includes a base plate, a sealing surface 51 for connecting the bracket, and a wear-resistant and corrosion-resistant coating. The wear-resistant and corrosion-resistant layer is provided on one side of the base plate facing the heat exchange plate 2, and the sealing surface 51 is located on the side facing the bracket 1. After step S300, there is also step S400: arrange the base plate of the sealing plate 5 with the wear-resistant and corrosion-resistant coating facing the heat exchange plate 2, and the sealing surface 51 of the sealing plate 5 faces the bracket 1 and is welded and sealed with the bracket 1 through the sealing surface 51.

[0045] Adopting the foregoing technical solution, the setting of the sealing plate 5 further enhances the sealing performance of the entire heat exchange device. By arranging the side of the sealing plate 5 with the wear-resistant and corrosion-resistant coating facing the bracket 1 and welding and sealing it with the bracket 1 using the sealing surface 51, it can effectively prevent the hot-side fluid from leaking from the edge part of the device, improving the safety and stability of the device operation. The setting of the sealing plate 5 and the design of its surface coating and sealing surface 51 are adapted to the processing techniques of components such as the heat exchange plate 2 and the side plate 3 in the previous steps. All components of the entire device adopt wear-resistant and corrosion-resistant protection measures, forming a complete protection system, enabling the device to better perform its functions in a complex working environment and improving the applicability and durability of the device.

[0046] Further, both ends of the sealing plate 5 extend and cover the outer end surface of the bracket 1, and the sealing plate 5 is welded and sealed with the outer end surface of the bracket 1.

[0047] Adopting the foregoing technical solution, welding the sealing plate 5 to the front and back surfaces of the bracket 1 further enhances the sealing performance at the front and rear ends of the heat exchanger. When the flue gas on the hot side and the cold-side fluid flow inside the device, they are more tightly restricted within the established space, effectively preventing the fluid from leaking from the front and rear ends of the heat exchanger, ensuring the stable progress of the heat exchange process in a closed environment, and improving the safety and reliability of the device operation.

[0048] Further, the wear-resistant and corrosion-resistant coating includes one of an enamel coating, a metal-based coating, an electroplated hard chromium coating, a plasma-sprayed ceramic coating, a chemical vapor deposition ceramic coating, and an epoxy ceramic coating.

[0049] Adopting the foregoing technical solution, the enamel coating used on the surface of the heat exchanger has excellent corrosion resistance and can resist the erosion of various chemical substances such as acids, alkalis, and salts; the surface is smooth, not easy to adhere to dirt and impurities, has good wear resistance, and can effectively reduce friction loss; it has good insulation performance and can avoid electrical failures during the operation of the equipment. The metal-based coating is a coating formed on the metal surface by methods such as thermal spraying and electroplating with metal as the matrix and adding various alloying elements or ceramic particles and other reinforcing phases. Its principle is to utilize the toughness of the metal matrix and the wear resistance, corrosion resistance, etc. of the reinforcing phase to improve the comprehensive performance of the coating. The electroplated hard chromium coating is a hard and bright coating formed by depositing chromium metal on the metal surface through the electroplating process. During the electroplating process, chromium ions gain electrons at the cathode and are reduced to chromium atoms, gradually depositing to form the coating. Chromium has high hardness and a low friction coefficient, and can improve the wear resistance and corrosion resistance of the coating. The plasma-sprayed ceramic coating is to use the high temperature generated by the plasma arc to melt the ceramic powder and spray it onto the metal surface at high speed to form a ceramic coating. Ceramic materials have characteristics such as high hardness, high melting point, and good chemical stability, and are combined with the metal matrix through the plasma spraying process to play a role in wear resistance and corrosion resistance. The chemical vapor deposition ceramic coating is to use gaseous substances to undergo chemical reactions at high temperatures and deposit a ceramic coating on the metal surface. By controlling parameters such as the type, concentration, and temperature of the reaction gas, the composition and structure of the coating can be precisely controlled, thereby obtaining ceramic coatings with different properties. The epoxy ceramic coating is a coating made with epoxy resin as the matrix and adding ceramic powder and other fillers. Epoxy resin has good bonding performance and corrosion resistance, and the ceramic powder can improve the hardness and wear resistance of the coating. During the curing process, the epoxy resin undergoes a cross-linking reaction with the curing agent to form a three-dimensional network structure, firmly bonding the ceramic powder together to form a wear-resistant and corrosion-resistant coating.

[0050] Example 2: As Figure 3 shown, it further includes several intermediate plates 4. In step S300, the side plates 3 are hermetically welded to the bracket 1 through the intermediate plates 4, and two adjacent front and rear side plates 3 are hermetically welded together through the intermediate plates 4.

[0051] Adopting the foregoing technical solution, the addition of the intermediate plate 4 increases the connection area and connection points between the side plate 3 and the bracket 1 and between adjacent side plates 3, making the connection between the entire heat exchange plate 2 assembly and the bracket 1 more firm. During the operation of the equipment, it can better withstand external forces such as internal medium pressure and vibration, reduce problems such as deformation and loosening caused by uneven stress at the connection surface 32, improve the strength and stability of the overall structure of the equipment, and extend the service life of the equipment.

[0052] Specifically, the intermediate block includes an intermediate block with a T-shaped cross-section and an intermediate block with a sheet-shaped cross-section for covering the connection between two sides.

[0053] In addition to the above preferred embodiments, there are other embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection requested by this application.

Claims

1. A method for manufacturing a heat exchanger, characterized in that: The heat exchanger comprises a bracket, a heat exchange plate provided with a cold side inlet and outlet, and a plurality of side plates with through holes, wherein the through holes are adapted to the cold side inlet and outlet of the heat exchange plate; S100: sealing and welding the cold side inlet and outlet of the heat exchange plate and the through hole of the side plate together; S200: coating the outer surface of the heat exchange plate with a wear-resistant and corrosion-resistant layer; S300: Seal and connect the side plates in step S200 to the bracket in sequence along the front-to-back direction, so that the heat exchange plates are distributed in the bracket in a front-to-back spaced manner.

2. The method for manufacturing a heat exchanger according to claim 1, characterized in that: In step S200, the side plate includes a body and a wear-resistant and corrosion-resistant layer, and the wear-resistant and corrosion-resistant layer is provided on a side of the body facing the heat exchange plate.

3. The method for manufacturing a heat exchanger according to claim 2, characterized in that: In step S200, the main body includes a connection surface facing adjacent side panels, and two adjacent side panels are connected via the two connection surfaces.

4. The method for manufacturing a heat exchanger according to claim 3, characterized in that: In step S300, two adjacent connection surfaces are sealed and connected by welding.

5. The method for manufacturing a heat exchanger according to claim 3, characterized in that: In step S300, two adjacent connection surfaces are sealed and connected by a combination of a detachable connection component and a sealing strip.

6. The method for manufacturing a heat exchanger according to claim 1, characterized in that: It also includes a plurality of middle plates. In step S300, the side plates are sealed and welded to the bracket through the middle plates, and the front and rear adjacent side plates are sealed and welded together through the middle plates.

7. The method for manufacturing a heat exchanger according to claim 1, characterized in that: In step S300, the cold side fluid enters and exits from the cold side inlet and outlet and flows in the left-right direction; the hot side fluid flows from top to bottom in the flue gas channel between two adjacent heat exchange plates.

8. The method for manufacturing a heat exchanger according to claim 1, characterized in that: It also includes a sealing plate, which includes a substrate, a sealing surface for connecting to a bracket and a wear-resistant and corrosion-resistant coating, wherein the wear-resistant and corrosion-resistant layer is arranged on a side of the substrate facing the heat exchange plate, and the sealing surface is located on a side facing the bracket. After step S300, there is another step S400: the side of the substrate coated with the wear-resistant and corrosion-resistant coating on the sealing plate is arranged to face the heat exchange plate, and the sealing surface of the sealing plate faces the bracket and is welded and sealed with the bracket through the sealing surface.

9. The method for manufacturing a heat exchanger according to claim 8, characterized in that: Both ends of the sealing plate extend to cover the outer end surface of the bracket, and the sealing plate and the outer end surface of the bracket are welded and sealed.

10. The method for manufacturing a heat exchanger according to claim 1, characterized in that: The wear-resistant and corrosion-resistant coating includes one of an enamel coating, a metal-based coating, an electroplated hard chrome coating, a plasma sprayed ceramic coating, a chemical vapor deposition ceramic coating and an epoxy ceramic coating.

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